/**
 * @phpstan-type MyType<T> array{create: callable(): T, test: callable(T): void}
 */
class HelloWorld
{
    /**
     * @template U
     * @param MyType<U> $case
     * @return U
     */
    public static function takesMyType(array $case): mixed
    {
        $theThing = $case['create']();

        $case['test']($theThing);
		
        return $theThing;
    }
}